Fluid operating propeller



Jan. 7, 1936. w H. LEINWEBER I fi fl FLUID OPERATING PROPELLER Filed-April 19, 1935 INVENTOR.

WJLVMNM Wm $56M.

ATTORNEY.

Cll

Patented Jan. 7, 1936 UNITED STATES PATENT OFFICE 2 Claims.

The present invention relates to propellers for operating on fluids.

Among the objects of the invention, is to provide a novel propeller adapted to act equably on the fluid throughout the radial extent of the propeller blades and to effect a stress and movement of the fluid radially so as to increase the velocity and volume of the stream of the fluid affected by the propeller and to increase the effectiveness thereof. The invention is, for the purpose of i1- lustration, shown in connection with a blower device, wherein a fluid such as air, is drawn in at the eye of the blower, and is forced by the novel means of the invention, radially to the peripheral ends or tips of the blades into a stream to be tangentially discharged from the blower casing.

Another object of the invention is to provide a novel propeller with blades carrying vanes which are so disposed as to act upon and force the fluid acted upon, in a direction away from the center of action or axis of rotation to and toward the periphery of the propeller to efliciently intensify the stream of the fluid forced and propelled by the propeller, the vanes being so pitched in angle or curved with relation to the radii of the blades as to efiect a mechanical component of radial force or stress upon the fluid acted upon as to cause the fluid to move with increased force or stress in a radial direction and to be propelled in a tangential stream from the propeller and blower housing.

A further object of the invention is to provide novel means at the hub of the propeller with means, which may be in the form of a scoop or the like, so as to act efficiently upon the fluid to cause the same to move in increased volume and pressure in a radial direction to enforce the stream of fluid otherwise acted upon by the propeller and its vanes as aforesaid.

Other objects, capabilities, advantages and features of the invention are comprehended thereby as will later appear and as are inherently possessed thereby.

Referring to the drawing;

Fig. 1 is a plan or elevational View of a pro peller constructed in accordance with the invention;

Fig. 2 is an end View of the invention; and

Fig. 3 is an elevational View with parts in broken section, of a blower embodying the invention.

Referring more in detail to the drawings, the embodiment selected to illustrate the invention is shown as comprising a hub I suitably apertured to receive a shaft of a motive power unit.

Extending radially and formed either integrally or rigidly with the hub l are radially extending blades 2 having peripheral ends or tips 3 as shown. Each blade is preferably curved in section and provided with a leading edge 4 and a trailing edge 5, so that the inclinations of the blade or the pitch thereof increases progressively toward the outer end or periphery of the blades. In other words, the blade portion 6 which is nearer the hub than the blade portion 7 which is nearer the periphery, is tipped less or has less pitch than the portion which is more remote from the hub, so that the more remote part of the blade will more easily cut into the fluid as the blades are rotated. Between the blade portion 6 and the hub each blade is provided with a concaved portion 8 having a leading edge 9 which is preferably disposed at an inclination to the axis of the propeller, so that as the propeller is rotated the fluid may be received into the concaved portion 8 and caused to be forced therefrom in a more or less radial direction toward the periphery or tipped portions 1 of the blade 2.

Each blade carries a series of vanes I0 which are disposed generally in parallelism with the axis of the propeller and which are distributed radially along the blades 2 so that the distances between the vanes It will increase radially of the series, such that the two outer vanes near the periphery of the propeller, will be at a greater distance than the vanes of the series toward the hub or axis of the propeller. These vanes may be disposed generally at an angle to the radius and are preferably curved so as to present their concaved surfaces toward the periphery of the blades and their convexed surfaces toward the center of the propeller so that as the propeller is rotated, the fluid will be acted upon by the concaved surfaces of the vanes so as to force the fluid in a radial direction. The vanes extend through or from both sides of the blades and are preferably of greater Width on the trailing side of the blades 1 than on the leading side thereof as clearly shown in Fig. 2 of the drawing.

The vanes and the blades may be cast integrally in a single piece, or if desired, the vanes may be suitably secured to the blades in any manner desired, as by Welding or otherwise.

In Fig. 3 a blower is shown comprising a casing I I having an inlet eye l2 and a discharge outlet IS. Within the casing is rotatably supported a propeller provided with blades 1 and vanes l0. As will be seen, when the propeller is rotated in the direction of the arrow, the fluid is drawn into the blower through the eye l2 and is forced radially toward the periphery thereof into an intense and large volume stream to be discharged through the outlet as indicated by the arrows l4.

While I have herein described and upon the drawings shown an illustrative embodiment of the invention, it is to be understood that the invention may comprehend other constructions, arrangements of parts, details and features without departing from the spirit of the invention.

Having thus disclosed the invention,

I claim:

1. A propeller for acting on fluid, comprising radially extending blades pitched at an increasing angle radially of the propeller, vanes carried thereby and extending therethrough, said vanes having concave faces presented radially outwardly, said vanes on one side of the blade extending more than the full width of the blade and on the other side extending only from that portion near the trailing edge and therebeyond.

2. A propeller for acting on fluid, comprising radially extending blades pitched at an increasing angle radially of the propeller, vanes carried thereby and extending therethrough said vanes extending beyond the trailing edge, and on the concave side of the blade extending the entire width thereof and on the convex side extending only from near the trailing edge. 

